CWK 7800mAh 9 Cell Capacity Battery for Samsung NP-RV510-A05US NP-RV515-A02US NP-RV711-A01US RV408 RV410 RV411 RV415 RV420 RV508 RV510 RV511 RV515 R528 R540 R620 R720 R730 E251 E272 E341 Condition: Brand New - Grade A cells Battery Type: Li-ion Voltage: 11.1 Volt (10.8 Volt compatible) Capacity: 7800mAh (Better than 6600mAh) 90 Day Money Back. Buy with confidence!